Boxster Calipers, got them installed today! Options

[wndsrfr]

Lookin' way good!!!!!!

I have Carrera calipers too. A Wilwood conversion is a little more complicated since a 90 degree adapter isn't in the cards. Since I have a couple of those left over after replacing my fronts with differential billets, I think I'll stick with them... dangit. I already have the SC and Carrera rotors but figured the SC hats weighed a little less. I know... splitting hairs.

Nice work!

Don't give up on the Wilwoods... do a search on my user name and Wilwood... actually easy to make the spacers...

[roblav1]

I've got the same setup with Boxster calipers and 19mm master. Thoroughly pressure bled the system twice and still getting soft pedal. Yes, I first bled the master and both valves on each caliper. And all bleed valves are up. And using that Ate high temp fluid.

One thing bothered me... when I opened the switch on the master, nothing came out. Is that normal? It's been a few years, but I'd swear that fluid bleeds there on 911 masters.

[RiqueMar]

Contributing to this thread revival...

I have Early ‘S’ Calipers rebuilt by PMB and never used, and am toying with switching to Boxster or larger brakes for the look, as I understand from Eric that the ‘stopping power’ will be equal.

I’m wondering, can I just purchase the adaptor and caliper and swap these?

[RiqueMar]

Sorry for the multiple-post, photos for reference. Heads up, these may be in the classifieds soon (shameless plug)....

[914Toy]

I mounted Boxter front calipers, with the "u" brake fluid tube swopped position (causes the correct pistons leading), and 911 Carrera rotors in front. Left the refurbished 914 brakes on the back (PMB), with a refurbished proportioning valve (PMB). Kept a good order 19mm Master Cylinder and SS braded brake lines all previously installed. All of this on my converted 914-6 (2.7 L). This setup feels perfect under all serious breaking challenges.

[vfe95]

Hi there,
On the way to build a 914GT, 5lugs and 911 e-brake mod ready on the rear but concerning Boxster calipers evo, I can't find nowdays adapters to match SC rotors (20mm) with these calipers (S or notS) like RJ did. => Anyone has a link to a solution in 2023 (IMG:style_emoticons/default/wink.gif) (only found adapters for boxster rotors with offset not compatible of e-brake mod...)

Furthermore, I have 996.352.421/422 calipers and not 986.352.xxx ones, like others folks here; the question about the technical difference and compatibility was raised on that thread ... but not answered; any tip ?

Thanks for your help
Vincent, France

[mepstein]

The Boxster brake setup is early (non S) calipers and 24mm Carrera rotors.

[vfe95]

Thanks for fast reply mepstein. It's for rear. A link to such adapter ? can't see on 914-6Werkshop (IMG:style_emoticons/default/wink.gif)) Little bit confused: boxster 996.352.42X rear calipers in my hands (so S type?) have pins that allow only 20mm rotors...

[SirAndy]

Thanks for fast reply mepstein. It's for rear. A link to such adapter ? can't see on 914-6Werkshop (IMG:style_emoticons/default/wink.gif)) Little bit confused: boxster 996.352.42X rear calipers in my hands (so S type?) have pins that allow only 20mm rotors...

From my first post in this thread:

Well, i have 24mm Carrera rear rotors. The Boxster Calipers had to be machined (2mm off each of the brake pad pins) and the adapters had to be milled to center the Boxster Calipers over the wider rotors.

(IMG:style_emoticons/default/bye1.gif)

[davenorcal]

My caliper pins are rubbing on my rotor and I hope to get some advice from this group. The car is a ‘70 914/6 (factory) that was restored as a GT tribute about 15 years ago.

It is running 1st gen Boxster calipers (986-351-421) on a 911 strut (911-341-041) with a misaligned rotor, The rotor is unknown, but is 24mm thick, 11” diameter and is not centered in the caliper. It looks like I might have the wrong rotor on this set up. The questions at this point are:
1. where is this strut from
2. is the Boxster caliper an okay fit (seems spot on from what I’ve read).
3. What rotor should I be running; and
4. what modification are needed to fix the misalignment? The Caliper needs to move .06” (1.5 mm) outward so the rotor will be centered between the pins. I can’t see how one could shim the calipers in the correct direction.

Pictures to follow…

[davenorcal]

The picture above is a view of the outer side. The next picture is of the inside of the rotor. You will notice the pin is riding on the outside surface of the rotor and pics of the inside of the caliper shows the pin about 3mm away from the face of the rotor.

[SirAndy]

@davenorcal

From my first post in this thread:

...
First, i failed to read Rich's instructions that clearly state that you have to use a 20mm 911 SC rear rotor.

Well, i have 24mm Carrera rear rotors. The Boxster Calipers had to be machined (2mm off each of the brake pad pins) and the adapters had to be milled to center the Boxster Calipers over the wider rotors.
...

Post #4 and #5 in this thread show the milled down adapters to allow the calipers to be centered over the 24mm rotors.

(IMG:style_emoticons/default/bye1.gif)

[davenorcal]

@davenorcal

From my first post in this thread:

...
First, i failed to read Rich's instructions that clearly state that you have to use a 20mm 911 SC rear rotor.

Well, i have 24mm Carrera rear rotors. The Boxster Calipers had to be machined (2mm off each of the brake pad pins) and the adapters had to be milled to center the Boxster Calipers over the wider rotors.
...

Post #4 and #5 in this thread show the milled down adapters to allow the calipers to be centered over the 24mm rotors.

(IMG:style_emoticons/default/bye1.gif)

@sirandy - Thank you. I read that and I could not visualize how inserting an adapter solved my problem. It looked to me I needed to shave 1.5mm off the face of the caliper where it seats to the flange of the strut for the caliper to go in the needed direction. Clearly, I’m missing something.

Please send pics of the back side so I might see the configuration, if possible. Thanks again!

Also, after re-reading the string I figured I’d reach out to @a914guy to get the lowdown on his adapters. Once I see the adapter in place it might sink into my thick skull. (IMG:style_emoticons/default/confused24.gif)

[SirAndy]

@sirandy - Thank you. I read that and I could not visualize how inserting an adapter solved my problem. It looked to me I needed to shave 1.5mm off the face of the caliper where it seats to the flange of the strut for the caliper to go in the needed direction. Clearly, I’m missing something.

Please send pics of the back side so I might see the configuration, if possible. Thanks again!

Also, after re-reading the string I figured I’d reach out to @a914guy to get the lowdown on his adapters. Once I see the adapter in place it might sink into my thick skull. (IMG:style_emoticons/default/confused24.gif)

@davenorcal
You already have the adapters mounted to your calipers. I can clearly see them in your pictures.
I milled down the adapters so the calipers end up centered on the 24mm rotors.

And as mentioned, i also shaved down the pins.
(IMG:style_emoticons/default/bye1.gif)

PS: Yours don't appear to be the Rich's adapters, unless he has a new design. But it can't hurt to contact him anyways.

[burton73]

@sirandy - Thank you. I read that and I could not visualize how inserting an adapter solved my problem. It looked to me I needed to shave 1.5mm off the face of the caliper where it seats to the flange of the strut for the caliper to go in the needed direction. Clearly, I’m missing something.

Please send pics of the back side so I might see the configuration, if possible. Thanks again!

Also, after re-reading the string I figured I’d reach out to @a914guy to get the lowdown on his adapters. Once I see the adapter in place it might sink into my thick skull. (IMG:style_emoticons/default/confused24.gif)

@davenorcal
You already have the adapters mounted to your calipers. I can clearly see them in your pictures.
I milled down the adapters so the calipers end up centered on the 24mm rotors.

And as mentioned, i also shaved down the pins.
(IMG:style_emoticons/default/bye1.gif)

PS: Yours don't appear to be the Rich's adapters, unless he has a new design. But it can't hurt to contact him anyways.

Hi Guys,

I happen to have a set of Boxster NON S calipers rebuilt by Rick several years ago with his adapters set to go on my 85 carrera front end with Elephant Polly Bronz.

Just so you guys can see what these boys look like.


Best Bob B

[davenorcal]

@sirandy - Dang, you are so right. I took pics of the back side so everyone can see them from another angle and see the left adapter is stamped “RTB 911F-MBC”. Thanks for hanging in there with me on this!

@Burton73 - thanks for your pics…helpful.

[ClayPerrine]

One of the other things about running Boxster calipers on the rear is that you have to grind off the bottom edge of the inboard pad. Otherwise they hit the adapter and won't go in far enough to put in the pins.

[SirAndy]

One of the other things about running Boxster calipers on the rear is that you have to grind off the bottom edge of the inboard pad. Otherwise they hit the adapter and won't go in far enough to put in the pins.

(IMG:style_emoticons/default/agree.gif)

I'm showing that in post #7:
http://www.914world.com/bbs2/index.php?s=&...t&p=1634381
(IMG:style_emoticons/default/sawzall-smiley.gif)